When there is an unexpected failure in the ssh connection, like:
FATAL: command execution failed
hudson.util.IOException2: Failed to join the process
at hudson.Proc$RemoteProc.join(Proc.java:269)
at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:84)
at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58)
at hudson.model.Build$RunnerImpl.build(Build.java:195)
at hudson.model.Build$RunnerImpl.doRun(Build.java:151)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:272)
at hudson.model.Run.run(Run.java:923)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)
Caused by: java.util.concurrent.ExecutionException:
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request$1.get(Request.java:188)
at hudson.remoting.Request$1.get(Request.java:157)
at hudson.remoting.FutureAdapter.get(FutureAdapter.java:55)
at hudson.Proc$RemoteProc.join(Proc.java:261)
... 9 more
Caused by: hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:223)
at hudson.remoting.Channel.terminate(Channel.java:528)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:697)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:678)
FATAL: Unable to delete script file /tmp/hudson7182116958611275696.sh
hudson.util.IOException2: remote file operation failed
at hudson.FilePath.act(FilePath.java:596)
at hudson.FilePath.delete(FilePath.java:793)
at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:94)
at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58)
at hudson.model.Build$RunnerImpl.build(Build.java:195)
at hudson.model.Build$RunnerImpl.doRun(Build.java:151)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:272)
at hudson.model.Run.run(Run.java:923)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)
Caused by: java.io.IOException: already closed
at hudson.remoting.Channel.send(Channel.java:342)
at hudson.remoting.Request.call(Request.java:104)
at hudson.remoting.Channel.call(Channel.java:481)
at hudson.FilePath.act(FilePath.java:593)
... 10 more
FATAL: already closed
java.io.IOException: already closed
at hudson.remoting.Channel.send(Channel.java:342)
at hudson.remoting.Request.call(Request.java:104)
at hudson.remoting.Channel.call(Channel.java:481)
at hudson.Launcher$RemoteLauncher.kill(Launcher.java:528)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:277)
at hudson.model.Run.run(Run.java:923)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)

the processes on the slave keep on running.